Roller bearing failure is a major factor in failure of rotating machinery. As a fatal defect is detected, it is common to shut down the machinery as soon as possible to avoid catastrophic damages. Performing such an action, which usually occurs at inconvenient times, typically results in substantial time and economical losses. It is, therefore, important to monitor the condition of roller beari...

As distributed systems increase in popularity and experience resource contention, new resource allocation methods are needed for scalability and manageability. In this thesis, I investigate the use of auctions, a type of market-based methods, as a decentralized resource allocation approach. Agents in auctions individually submit bids that provide critical information, including agents‘ private ...

Small piezoelectric transducers bonded to the outer raceway of a rolling element bearing can be used to send ultrasonic pulses to the element-raceway contact and receive reflections. Interpretation of the magnitude and time of flight (ToF) of the reflections can be used to deduce amount of load imparted between roller and raceway. The approach is most successful when the sensor is smaller than ...

The interaction between the wheel and rail greatly influences the dynamic response of railway vehicles on the track. A roller rig facility can be used to study and monitor real time parameters that influence wheel-rail interaction such as wear, adhesion, friction and corrugation without actual field tests being carried out. This paper presents the development of the mathematical models for full...

Fairground operators are obliged to display a warning to the effect that people with heart disease should not ride on the roller coasters. A 31 year old man with a history of sustained monomorphic ventricular tachycardia induced by exercise ignored this advice and survived a ride on a roller coaster at the Glasgow Garden Festival without adverse effects. This prompted us to monitor heart rate b...

Burnishing is a cold working technique used as surface enrichment to meet the desired properties of workpiece. It improves visual properties, dimensional tolerances, fatigue strength, roughness, and hardness work material by applying appropriate pressure through complex ball burnishing tool cause plastic deformation. In current work, mathematical modeling process was carried out predict roughne...

Observations of streamwise and crossflow instabilities on swept circular cylinders over a range of inclinations are presented. By considering sweep angles through the full range between the two extremes studied in the literature, we relate the streamwise vorticity of the unswept case (Kestin & Wood, J. Fluid Mech. 44) to the more aggressive crossflow instability at high sweep angles (Poll, J. F...

Compression garments for the lower limb were tested in two groups--general support garments and anti-embolism supports. A total of 98 patients was examined. The method used was by the interposition of partly fluid-filled pressure sensors between garment and skin. A combination of roller bandage with shaped tubigrip (SBB--Seton) and Sigvaris stockings afforded effective pressure in the general s...

Selective laser melting is a frequently used, powder bed fusion additive manufacturing technology for producing metallic parts. However, appropriate surface quality cannot be achieved, so post-processing often necessary. Subsequent machining of surfaces serves multiple objectives such as improvement dimensional accuracy, changing roughness and modification the residual stress state higher hardn...